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add a section about moving the database to another machine

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Sarah Hoffmann 2021-11-19 16:11:32 +01:00
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docs/admin/Advanced-Installations.md
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@ -101,7 +101,7 @@ This will get diffs from the replication server, import diffs and index
the database. The default replication server in the
script([Geofabrik](https://download.geofabrik.de)) provides daily updates.
## Importing Nominatim to an external PostgreSQL database
## Using an external PostgreSQL database
You can install Nominatim using a database that runs on a different server when
you have physical access to the file system on the other server. Nominatim
@ -109,6 +109,11 @@ uses a custom normalization library that needs to be made accessible to the
PostgreSQL server. This section explains how to set up the normalization
library.
!!! note
The external module is only needed when using the legacy tokenizer.
If you have choosen the ICU tokenizer, then you can ignore this section
and follow the standard import documentation.
### Option 1: Compiling the library on the database server
The most sure way to get a working library is to compile it on the database
@ -167,3 +172,44 @@ NOMINATIM_DATABASE_MODULE_PATH="<directory on the database server where nominati
Now change the `NOMINATIM_DATABASE_DSN` to point to your remote server and continue
to follow the [standard instructions for importing](Import.md).
## Moving the database to another machine
For some configurations it may be useful to run the import on one machine, then
move the database to another machine and run the Nominatim service from there.
For example, you might want to use a large machine to be able to run the import
quickly but only want a smaller machine for production because there is not so
much load. Or you might want to do the import once and then replicate the
database to many machines.
The important thing to keep in mind when transferring the Nominatim installation
is that you need to transfer the database _and the project directory_. Both
parts are essential for your installation.
The Nominatim database can be transferred using the `pg_dump`/`pg_restore` tool.
Make sure to use the same version of PostgreSQL and PostGIS on source and
target machine.
!!! note
Before creating a dump of your Nominatim database, consider running
`nominatim freeze` first. Your database looses the ability to receive further
data updates but the resulting database is only about a third of the size
of a full database.
Next install Nominatim on the target machine by following the standard installation
instructions. Again make sure to use the same version as the source machine.
You can now copy the project directory from the source machine to the new machine.
If necessary, edit the `.env` file to point it to the restored database.
Finally run
nominatim refresh --website
to make sure that the local installation of Nominatim will be used.
If you are using the legacy tokenizer you might also have to switch to the
PostgreSQL module that was compiled on your target machine. If you get errors
that PostgreSQL cannot find or access `nominatim.so` then copy the installed
version into the `module` directory of your project directory. The installed
copy can usually be found under `/usr/local/lib/nominatim/module/nominatim.so`.